--- rxvt-unicode/src/rxvtutil.h	2006/01/25 00:42:21	1.20
+++ rxvt-unicode/src/rxvtutil.h	2006/01/31 16:57:35	1.26
@@ -9,6 +9,31 @@
 #define PP_STRINGIFY_(a) #a
 #define PP_STRINGIFY(a) PP_STRINGIFY_(a)
 
+// actually, some gcc-3.x versions work, too
+#define HAVE_GCC_BUILTINS (__GNUC__ >= 4)
+
+#ifndef __attribute__
+# if __GNUC__
+#  if (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || (__GNUC__ < 2)
+#   define __attribute__(x)
+#  endif
+# endif
+# define __attribute__(x)
+#endif
+
+#define NORETURN __attribute__ ((noreturn))
+#define UNUSED   __attribute__ ((unused))
+#define CONST    __attribute__ ((const))
+
+// increases code size unless -fno-enforce-eh-specs
+#if __GNUC__
+# define NOTHROW
+# define THROW(x)
+#else
+# define NOTHROW  throw()
+# define THROW(x) throw x
+#endif
+
 extern class byteorder {
   static unsigned int e; // at least 32 bits
 public:
@@ -31,6 +56,26 @@
 
 template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
 
+template<typename T> static inline T squared_diff (T a, T b) { return (a-b)*(a-b); }
+
+// linear interpolation
+template<typename T, typename U, typename P>
+static inline
+T lerp (T a, U b, P p)
+{
+  return (long(a) * long(100 - p) + long(b) * long(p) + 50) / 100;
+}
+
+// some bit functions, xft fuck me plenty
+#if HAVE_GCC_BUILTINS
+static inline int ctz      (unsigned int x) CONST { return __builtin_ctz      (x); }
+static inline int popcount (unsigned int x) CONST { return __builtin_popcount (x); }
+#else
+// count trailing zero bits and count # of one bits
+int ctz      (unsigned int x) CONST;
+int popcount (unsigned int x) CONST;
+#endif
+
 // in range including end
 #define IN_RANGE_INC(val,beg,end) \
   ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
@@ -402,7 +447,7 @@
 void *rxvt_temp_buf (int len);
 
 template<typename T>
-inline T *
+static inline T *
 rxvt_temp_buf (int len)
 {
   return (T *)rxvt_temp_buf (len * sizeof (T));